钢锭凝固过程温度场数值模拟  

Numerical Simulation of Temperature Field of Ingot During the Solidification Process

作　　者：王晓花[1] 厉英[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《铸造》2013年第5期410-414,419,共6页Foundry

基　　金：国家自然科学基金资助项目(51274057);国家科技支撑计划项目(2011BAE13B03);国家高技术研究发展计划项目(2012AA03A508)

摘　　要：本研究采用大型商业软件MSC.Marc建立了38 t钢锭凝固传热数学模型,模型中的钢热物性参数是通过钢凝固过程微观偏析模型预测钢锭凝固过程相的变化规律,并根据钢锭凝固过程钢热物性参数与相组成之间的关系式来确定。随后采用红外测温试验验证了钢锭凝固传热数学模型,并模拟了钢锭凝固过程温度场变化规律以及不同浇注温度和冒口保温条件对钢锭凝固过程的影响。结果表明:钢锭凝固过程由钢锭底部向冒口逐渐凝固,随着钢锭冒口发热剂的加入,钢锭凝固末期,最后凝固区域逐渐从无发热剂情况时位于钢锭本体向冒口区域移动。38 t钢锭4125V2钢可采用向浇注后冒口加入200 mm厚发热剂增强钢锭凝固末期钢液补缩能力,脱模时间为浇注后12.5 h。A heat-transfer and solidification model were developed to predict the temperature field of 38 t ingot during the solidification process with the commercial software MSC.Marc, and the thermophysical properties of the steel in model were determined by the microsegregation model, which can predict the phase evolution of steel during the solidification process. The numerical model was validated by the temperature measurement and the temperature fields of the ingot during the solidification process with different pouring temperature and heating agent thickness were predicted by the numerical model. The results show that the ingot solidifies from bottom to riser in sequence, and the final solidification zone of ingot moves from the ingot body under the condition without heating agent to riser with the increase of the heating agent thickness. The 200 mm-thickness heating agent and 12.5 h knockout time are proposed for the 38 t ingot of 4125V2 steel casting.

关 键 词：钢锭 热物性参数 发热剂 温度场 数值模拟 

分 类 号：TG244.3[金属学及工艺—铸造]